Osteosynthetic pin

• US 4,898,186 A
• Filed: 04/29/1988
• Issued: 02/06/1990
• Est. Priority Date: 09/11/1986
• Status: Expired due to Term

• Current Assignee: Gunze Limited
• Original Assignee: Gunze Limited
• Inventors: Watanabe, Satoshi, Shimamoto, Takeshi, Shimizu, Yoshihiko, Suong, Hyu H., Ikada, Yoshito, Suzuki, Masakazu, Nakamura, Tatsuo
• Primary Examiner(s): Cannon, Alan W.
• Application Number:
  US07/199,412
• Time in Patent Office: 648 Days
• Field of Search: 623/16, 623/66, 128/92 YR, 128/92 YP, 128/92 Y, 128/92 YZ, 128/92 ZW, 264/164, 264/231
• US Class Current: 606/62
• CPC Class Codes: A61B 17/68 Internal fixation devices , including fasteners and spinal fixators, even if a part thereof projects from the skin bone staples A61B17/0642
• CPC Class Codes: A61B 2017/00004 (bio)absorbable, (bio)resorbable, resorptive for implantable prostheses A61F2210/0004
• CPC Class Codes: A61F 2002/30207 Double convex cones, i.e. element having two convex cones, one at each of its opposite ends
• CPC Class Codes: A61F 2230/0067 conical
• CPC Class Codes: A61L 31/06 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds A61L31/041 takes precedence
• CPC Class Codes: C08L 67/04 Polyesters derived from hydroxycarboxylic acids, e.g. lactones C08L67/06 takes precedence
• CPC Class Codes: Y10S 623/911 Bone

Abstract

An osteosynthetic pin characterized in that the pin is formed substantially of a poly-L-lactic acid having a molecular weight of at least about 70,000, and is formed by axially drawing about 2 to about 10 times at an elevated temperature of about 70° to about 120° C.

Claims

1. An osteosynthetic pin obtained by shaping a poly-L-lactic acid having a molecular weight of at least about 70,000 and axially drawing the shaped body about 2 to about 10 times at an elevated temperature of about 70°

to about 120°

C.

2. An osteosynthetic pin as defined in claim 1 wherein the poly-L-lactic acid has a molecular weight of at least about 100,000.

3. An osteosynthetic pin as defined in claim 1 wherein the poly-L-lactic acid contains about 1 to about 15 wt % of hydroxyapatite admixed with the poly-L-lactic acid.

4. An osteosynthetic pin as defined in claim 3 wherein the content of hydroxyapatite is in the range of about 5 to about 10 wt %.

5. An osteosynthetic pin as defined in claim 1 or 3 further comprising a bore extending axially through the pin.

6. A process for preparing an osteosynthetic pin, omprising:

shaping a poly-L-lactic acid having a molecular weight of at least about 70,000 and axially drawing the shaped body about 2 to about 10 times at an elevated temperature of about 70°

to about 20°

C.